Intermediate Sphenoid Bone Quiz

Q1. Which part of the sphenoid forms the posterior boundary of much of the anterior cranial fossa?

• Lesser wings
• Pterygoid plates
• Greater wings only
• Sphenoidal conchae

Q2. Which part of the sphenoid contributes substantially to the floor of the middle cranial fossa?

• Greater wings
• Crista galli
• Perpendicular plate
• Occipital condyles

Q3. What is the dorsum sellae?

• Roof of the nasal cavity
• Inferior edge of the lateral pterygoid plate
• Posterior wall of the sella turcica
• Anterior wall of the orbit

Q4. Which processes project from the lesser wings near the sella turcica?

• Styloid processes
• Anterior clinoid processes
• Coronoid processes
• Mastoid processes

Q5. Which cranial nerves pass through the superior orbital fissure?

• III, IV, V1, and VI
• V2, V3, IX, and X
• II, VII, VIII, and XII
• I, II, IX, and XI

Q6. Where does foramen rotundum open anteriorly?

• Submandibular fossa
• Posterior cranial fossa
• Pterygopalatine fossa
• External acoustic meatus

Q7. Where does foramen ovale open inferiorly?

• Nasal vestibule
• Orbit
• Infratemporal fossa
• Posterior cranial fossa

Q8. Which muscle arises mainly from the lateral surface of the lateral pterygoid plate?

• Buccinator muscle
• Lateral pterygoid muscle
• Stylohyoid muscle
• Mylohyoid muscle

Q9. Which muscle takes origin from the medial surface of the lateral pterygoid plate and nearby structures?

• Medial pterygoid muscle
• Digastric muscle
• Genioglossus muscle
• Masseter muscle

Q10. Which small hook-like projection is found at the inferior end of the medial pterygoid plate?

• Pterygoid hamulus
• Anterior clinoid process
• Styloid process
• Lingula